Combined steel and concrete pile.



F. L. PRUYN.

COMBINED STEEL AND CONCRETE PILE.

APPLICATION FILED MAR. 11. m4.

1.225,855@ Patented May 15,1917.

W w. m

UNITED FFIQE.

FRANCIS I1. PRUYN, OF NEW YORK, N. Y.

COMBINED STEEL AND CONCRETE lILE.

Application filed March 17, 1914.

To all whom it may concern:

Be it known that I, FRANCIS L. PRUYN, a citizen of the United States, and a resident of the city, county, and State of New York, have invented certain new and useful Im )rovements in Combined Steel and Concrete Piles, of which the following is a full, clear, and exact specification, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in Combined steel and concrete piles used in foundation work. These piles consist of heavy cylinders, and are driven by sections to bed rock, and then blown clear by compressed air and filled with concrete. The sections are held together by cast steel or malleable iron bushings. It is' of the utmost importance that the bushings should hold the sections in perfect alinement while they are being driven; else a weakness in the pile underground will result, due to an undiscovered telescoping of the sections. It is of almost equal importance that the oini's between the sections should be fluid-tight; otherwise damage to adjoining foundations will result when the piles are driven on party lines, due to escape of air under heavy pressure in the process of blowing the tubes clear, and also to the escape of water from the plastic concrete. An imperfect joint will also admit into the tube water and quiclo sand, thereby damaging the plastic concrete subsequently deposited therein.

In my application Ser. No. 580,356, I have shown a tube joint and guide for connecting sections of steel and concrete piles the general design of which I consider best adapted for securing a fluid-tight joint between the sections and for holding the sections in alinement while they are driven to bedrock. The object of my present invention is to improve the tube joint and guide referred to by making it less likely that the ends of the tube sections will be split or buckled when driven onto the ends of the bushing. The ends of the bushing extend into the tube ends to a certain extent in order to obtain a hold to prevent the parts from getting out of alinement, and it has sometimes been found, when the fit was snug Specification of Letters Patent.

Patented May 15, 1917.

Serial No. 825,245.

to make the joint watertight, that it was difiicult to drive the tube ends into place without splitting or buckling the same. I have overcome this difficulty by making the outer ends of the bushing resilient and of sufficient strength to hold the parts in alinement, and the inner portion nonresilient and adapted to fit snug and effect a watertight joint. I thereby reduce the extent of the snug fit liable to split or buckle the tubes, but, at the same time, preserve the long hold of the bushing necessary to keep the parts in alinement.

In the accompanying drawings, Figure 1 shows two tube sections united with my improved bushing, the tube sections being shown in cross-section and the bushing in elevation. Fig. 2 is a sectional view of the bushing shown in Fig. 1.

Referring to the drawings in detail, 1 represents two tube sections, and 2 the bushing as a whole in position between the sections. 3 is a flange upon the bushing, having beveled faces 4. 5 indicates a series of resilient members extending from the inner or nonresilient portion of the bushing. The outside diameter of the bushing is not as great at the ends of the resilient members as it is near the flange, the object being to enable these members to readily enter the ends of the tube sections as leaders and grip the interior and hold the parts in alinement as the tube ends are driven over'the nonresilient and close-fitting portion of the bushing and into the beveled faces of the flange to make the desired watertight joint.

In practical operation, a tube section is driven into the ground by a suitable driver. The resilient members of a bushing are then inserted into the upper end of the driven section, and another tube section is placed over the resilient members of the other end of the bushing. The driving is then continued, the ends of the tube sections being forced into place within the beveled faces of the flange upon the bushing. These op erations are repeated until the lower end of the cylinder reaches bedrock, when the ground within the cylinder is blown out by compressed air, and the cylinder is filled with plastic concrete.

WVhat I claim is: alinement and a nonresilient portion adapt- The combination with a pair of tubular ed to effect a Watertight joint in conjuncsectlons of a bushing provided with a cention With the flange portion.

tral flange portion having faces beveled in- FRANOIS L. PRUYN. 5 Wardly for confining the abutting ends of In the presence of the sections and having ends provided With RALPH JULIAN SAoHnR's,

resilient portions for holding the sections in BERTHA M. KELLY.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

1 Washington, I). 0." 

